Why need loops.

Often when you write php code, you want the same block of code to run over and over again a certain number of times.

So, instead of adding several almost equal code-lines in a script, we can use loops.

Loops are used to execute the same block of code again and again

And there have four types of php codes such as,

• While.
• Do-while.
• For.
• Foreach.

While loop.

$x = 1;

while($x <= 5) {
  echo "The number is: $x <br>";
  $x++;

• $x = 1; – Initialize the loop counter and set the start value to 1
• $x <= 5 – Continue the loop as long and less than or equal to 5
• $x++; – Increase the loop counter value by 1 for each iteration

Do-while loop.

<?php
$x = 1;

do {
  echo "The number is: $x <br>";
  $x++;
} while ($x <= 5);
?>

The example below first sets a variable $x to 1 ($x = 1).

 Then, the do while loop will write some output

and then increment the variable $x with 1.

Then the condition is checked (is $x less than, or equal to 5?).

 and the loop will continue to run as long as $x is less than, or equal to 5.

for loop.

for ($x = 0; $x <= 10; $x++) {
  echo "The number is: $x <br>";

• nit counter: Initialize the loop counter value
• test counter: Evaluated for each loop iteration. If it evaluates to TRUE, the loop continues. If it evaluates to FALSE, the loop ends.
• increment counter: Increases the loop counter value.

• $x = 0; – Initialize the loop counter ($x), and set the start value to 0
• $x <= 10; – Continue the loop as long as $x is less than or equal to 10

$x++ – Increase the loop counter value by 1 for each iteration.

Foreach loop.

for ($x = 0; $x < 10; $x++) {
  if ($x == 4) {
    break;
  }

The break statement can also be used to jump out of a loop.

Continue statements.

for ($x = 0; $x < 10; $x++) {
  if ($x == 4) {
    continue;
  }

The continue statement breaks one iteration.

PHP Tutorial Part 1.